condition mean min max ZT0-3 3.90315 3.90315 3.90315 ZT4-7 2.5774299999999997 2.5774299999999997 2.5774299999999997 ZT8-11 3.34384 3.34384 3.34384 ZT12-15 3.377505 3.377505 3.377505 ZT16-19 5.151635 5.151635 5.151635 ZT20-23 4.309115 4.309115 4.309115